申请人:Sandoz Ltd.
公开号:US05118853A1
公开(公告)日:1992-06-02
Process for the synthesis of compounds of the formula ##STR1## comprising the steps of (i) reacting a compound of the formula ##STR2## with oxalyl chloride or oxalyl bromide to form the corresponding compound of the formula ##STR3## (ii) reacting said compound of the formula ##STR4## with a compound of the formula ##STR5## to form the corresponding compound of the formula ##STR6## (iii) hydrolyzing said compound of the formula ##STR7## to obtain the corresponding compound of the formula ##STR8## the use of the compounds of the formula ##STR9## for the synthesis of the compounds of the formula ##STR10## and the use of the intermediates of Formula VII for the direct synthesis of the compounds of Formula II, wherein R.sub.1 is C.sub.1-3 alkyl, phenyl or phenyl substituted by 1 to 3 substituents each of which is independently C.sub.1-3 alkyl, C.sub.1-3 alkoxy, fluoro, chloro, bromo or nitro (maximum of two nitro groups), R.sub.1b is phenyl or phenyl substituted by 1 to 3 substituents each of which is independently C.sub.1-3 alkyl, C.sub.1-3 alkoxy, fluoro, chloro, bromo or nitro (maximum of two nitro groups), R.sub.2 is C.sub.1-3 alkyl, one of R.sub.3 and R.sub.4 is ##STR11## and the other is primary or secondary C.sub.1-6 alkyl not containing an asymmetric carbon atom, C.sub.3-6 cycloalkyl or phenyl-(CH.sub.2).sub.m -, wherein R.sub.7 is hydrogen, C.sub.1-3 alkyl, n-butyl, i-butyl, t-butyl, C.sub.1-3 alkoxy, n-butoxy, i-butoxy, trifluoromethyl, fluoro, chloro, phenoxy or benzyloxy, R.sub.8 is hydrogen, C.sub.1-3 alkyl, C.sub.1-3 alkoxy, trifluoromethyl, fluoro, chloro, phenoxy or benzyloxy, R.sub.9 is hydrogen, C.sub.1-2 alkyl, C.sub.1-2 alkoxy, fluoro or chloro, and m is 1, 2 or 3, with the provisos that not more than one of R.sub.7 and R.sub.8 is trifluoromethyl, not more than one of R.sub.7 and R.sub.8 is phenoxy, and not more than one of R.sub.7 and R.sub.8 is benzyloxy, R.sub.5 is hydrogen, C.sub.1-3 alkyl, n-butyl, i-butyl, t-butyl, C.sub.3-6 cycloalkyl, C.sub.1-3 alkoxy, n-butoxy, i-butoxy, trifluoromethyl, fluoro, chloro, phenoxy or benzyloxy, and R.sub.6 is hydrogen, C.sub.1-3 alkyl, C.sub.1-3 alkoxy, trifluoromethyl, fluoro, chloro, phenoxy, or benzyloxy, with the provisos that not more than one of R.sub.5 and R.sub.6 is trifluoromethyl, not more than one of R.sub.5 and R.sub.6 is phenoxy, and not more than one of R.sub.5 and R.sub.6 is benzyloxy, R.sub.10 is C.sub.1-6 alkyl, each X is chloro or bromo, and each X.sup..crclbar. is chloride or bromide.
合成式为##STR1##化合物的过程,包括以下步骤:(i)将式为##STR2##的化合物与草酰氯或草酰溴反应,形成相应的式为##STR3##的化合物;(ii)将式为##STR4##的化合物与式为##STR5##的化合物反应,形成相应的式为##STR6##的化合物;(iii)水解式为##STR7##的化合物,获得相应的式为##STR8##的化合物。使用式为##STR9##的化合物合成式为##STR10##的化合物,并使用式为VII的中间体直接合成式为II的化合物,其中R.sub.1为C.sub.1-3烷基,苯基或苯基取代物,每个取代基都是独立的C.sub.1-3烷基,C.sub.1-3烷氧基,氟,氯,溴或硝基(最多两个硝基),R.sub.1b为苯基或苯基取代物,每个取代基都是独立的C.sub.1-3烷基,C.sub.1-3烷氧基,氟,氯,溴或硝基(最多两个硝基),R.sub.2为C.sub.1-3烷基,R.sub.3和R.sub.4中的一个为##STR11##,另一个为不含不对称碳原子的一级或二级C.sub.1-6烷基,C.sub.3-6环烷基或苯基-(CH.sub.2).sub.m-,其中R.sub.7为氢,C.sub.1-3烷基,正丁基,异丁基,叔丁基,C.sub.1-3烷氧基,正丁氧基,异丁氧基,三氟甲基,氟,氯,苯氧基或苄氧基,R.sub.8为氢,C.sub.1-3烷基,C.sub.1-3烷氧基,三氟甲基,氟,氯,苯氧基或苄氧基,R.sub.9为氢,C.sub.1-2烷基,C.sub.1-2烷氧基,氟或氯,m为1、2或3,条件是R.sub.7和R.sub.8中最多只有一个是三氟甲基,最多只有一个是苯氧基,最多只有一个是苄氧基,R.sub.5为氢,C.sub.1-3烷基,正丁基,异丁基,叔丁基,C.sub.3-6环烷基,C.sub.1-3烷氧基,正丁氧基,异丁氧基,三氟甲基,氟,氯,苯氧基或苄氧基,R.sub.6为氢,C.sub.1-3烷基,C.sub.1-3烷氧基,三氟甲基,氟,氯,苯氧基或苄氧基,条件是R.sub.5和R.sub.6中最多只有一个是三氟甲基,最多只有一个是苯氧基,最多只有一个是苄氧基,R.sub.10为C.sub.1-6烷基,每个X为氯或溴,每个X.sup..crclbar.为氯化物或溴化物。